Motor-driven saw



Nov. 8, 1927. 1,648,632k

J. BECK ET AL MOTOR DRIVEN sAw 2 Sheets-Sheet 2 'J. BECK ET Al.

MOTOR DRIVEN SAW Filed Feb. 11. 192e Lum Nov. 8, 1927.

yPatentedv Nov. s,, 19z7.

UNITED sTATEs JOSEPH BECK AND LIBIER'I E. GALLIN, F TAFT, CALIFORNIA.

Moron-DRIVEN SAW.

Application led February 11, 1926. Serial vNo. 87,619.

This invention relates to improvementsin power driven saws. r

An object'of this invention'is to provide a fsaw of improved constructionv which is 6 driven by means of avmotor and which 1s readily portable from place to place vso that it can be used for many different purposes. Another object of this'invention is to pro# vide an improved saw consisting essentially 10- of a frame, a motor mounted on the frame, a

saw. and an improved construction'connecting' the motor to thesaw so that the saw can be reciprocated by the motor relatlvely to the frame.

A further object of this invention 1s to provide a saw having the above mentioned characteristics and which has a handle with. which is associated al switch which controls the circuit through the electric motor which operates the saw.

A yfurther object'of this invention, is to provide a power driven saw having a handle at one end and a motor uponthe other end, so that the weight of, the motor willv bear down upon the saw.

A still further obj ect of this invention is to provide a powerdriven saw having a cable extending over a pulley suspended from a ceiling and a counterweight uponvthe other end of the cable, so that the saw mechanism will be supported by the counterweight to the desired extent. l

l/Vith the foregoing and other objects in view which will be made manifest in the following detailed description and specificati` ly pointed out in the appended claims, reference is had to the accompanying drawings for anillustrative embodiment of the invention,fwherein: y

Figure 1 is aI side elevation of theimproved power driven saw,parts being broken away and shown in vertical section,

Fig. 2 is a top plan view of the same,

Fig. 3 is a view taken substantially on the line 3-3 of Fig. 1,

Fig. 4 is a view taken substantially on the line 4 4 of Fig. 1,

Fig. 5 is a horizontal section taken on the line 5 5 of Fig. 1, v y' 50 Fig. 6 is a view in elevation, parts being broken away and shown in section, illustrating a detail of construction, and .v

Fig. 7 is a sectional view. taken on the linel 47-7 of Fig.'.6. y,

-Referring to the accompanying drawings wherein similar reference characters designate similar parts throughout, the improved saw conslsts of a frame having front and rear uprights 10 and 11, which are connected y at their upper ends by means of a cross bar 12. -In the lower ends of the uprights 10 and 11 there are formed'v bores 13 and 13,

and aA tubular part 14 may be formed integral with the forward upright 10 which has its interior in alignmentwith the borel 13 of the upright 10. Guide members 15 and 16` are sli-dable in each of the bores 13 13a and also in the tubular part 14. A saw-blade 17 has/its ends detachably connected to the guide members 15 .and-16 so' that one saw blade can be replaced by another. On the forward side of the upright 10 there is positioned a triangular plate 18,-this plate being either formed integral with the upright 10 or being attached thereto as by welding.

, It'carries lateral base flanges 19. Two divergent angle members 20 are secured to the oppositesides of the upright 10 and to the undersideof the base flanges 19 and project forwardly therefrom. In a similar manner a .pair of divergent angle irons 21 are welded or otherwise secured to the lower end of the upright 10 and extend forwardly therefrom. See Fig. 5. The forward ends of each of the angle. members 2O are connectedto the forward buds of their respective angle irons 21 by vertical braces 22, and similar bracesl 23 connect the argle irons intermediate their y ends. The forward ends of the angle irons 20 are connected .toeach other by means of a horizontal brace 24 and in a like 4manner the forward ends of the angle irons 21 are connected by a brace25. l

On top of the upper angle irons`-20 there is mounted an electric motor 26, .the rotor shaft of which is illustrated as being provided with a pinion 27. The rotor shaft extends through a plate 28 which is secured 'to the forward ends' of the angle irons 20 and 21 as by angles 29,'this plate forming the back wall lof a gear case or housing. The other walls offthe gear case, or houslng are provided by a. cover'30 which is detachably.

secured tothe 1plate 28.. A column 31 connects the uppen'rand lower braces 24 and l25 and provides a bearing for a small shaft 32 carrying a' gear 33 which meshes with the .pinion 27. The shaft 32 also carries a .'beveled pinion 34 which meshes withy the beveled gear 35 mounted on a shaft 36 which is" rotatable 'upon a support 37 mounted on one of the lower angle irons 21. The beveled i The guide.l member I16 is connected :to a tenfv sion spring 43, ywhich in turn is'connected to v r4an a'dJusting screw 44 mounted on a spring gear35 carries, a crank pin 38 or an eccentric rod, generally indicated at39. This eccentric rod'consists of two end members into whichlis threaded the ends of a-rod 40, the rod being locked as by lock nuts 41, so that. an adjustment of the length of the eccentric rod is permissible. The other4 end. of the eccentric rod 39 is pivotally connected to an arm42, which is yslidable `in a slot formedA in the .top of the tubular part 14.

housing 45. I i

y The operation of the above described construction is as follows: When the motor 26 is rotating, the pinion 27 drives the gear 33,

which in turn causes the beveled pinion 34 to drive the beveled gear 35. This operates the eccentric rod 39 and causes the guide member 15 to reciprocate, thus reciprocating the saw blade 17 and the guide member 16. The tension spring 43 serves to maintain the saw blade 17 under tension during the re- .ciprocation In this mannerl it will'be understood that the ramevmay be positioned so that the saw` blade is contacting with the v handle. Y outwardly into engagement with the stop 49 Work to be cut, and by holding the. frame stationary, the electric motor 26 will cause the blade 17 to reciprocate and to saw. Obviously, other types of constructions may be employed for causingthe motor 26 to reciprocate the saw blade 173' ifso desired.A

On the upright 11 there is provided a handle 46 and a movable member 47 has guide pins 48slidable in recesses formed in the The movable member 47 is urged by means of Vcoil springs 50disposed about the pins 48. In the handle fthere is positioneda contact 51 which 1s engageable by a i s movable contact 52 on themovable member 47. The stationary contact 51 may be con, nectedvby means of a-wire 53 to a source of electric current and the movable contact y52 is in a like manner connected to othe motor 26, the other terminal of the -mot or being connected to thesource of supply. In this manner the switch on the handle 46 controls the circuit4 through .the electric motor 26.

As the saw of this construction is fairly heavy, 1t isdesirable to mount a screw-eyeV '54 on the frameV which may be located at the point where the upright 10 is joined to the cross bar 12. A cableor similar supporting member 55 can be connected to the screw-eye 54'and be suspended from Vthe ceiling. If

desired, thiscable l55 may pass over pulleys- 55il and 55", and have, its opposite end connected to Fa balance weightA 55, and in this manner the saw may be supported. It is also desirable that a `plug 56 vhe provided upon the screw-eye0 to, which an electric light socket 56a may be attached, this plug serving to provide contactsenabling the electric curprovided, which is quiteportable and which has many advantages;x

It will be understood that variouschanges inthe detail of construction may be made without departing from the spirit or scope Of. course, if desired, the

of the inventionas del-ined by the appended claim?. We claim:

A motor driven saw comprising in combination a pair of uprights connected at one end by a cross bar, guiding means .in the] lower ends 'of ysaid uprights, guide members slidable 1n said guiding means and a saw connected to said guide members, an electric motor mounted on one of'said uprights,y means connecting said motor' to. one of said guide members to reciprocate the same and reciprocate thesaw, a handle associated with the other upright rat the'other end. of the frame from said electricl motor, said handle comprising a U-shapedmember, wells in said g U-shaped member, a pressure member eX- tending parallel to one side of said U-shaped member and havingpins 'receivable in said wells, sprlngs surrounding said pins to norico 'mally urge said pressure member away from said-handle memben and means whereby pressure upon said handle and the conse'- quent urging of said pressure member toward said handle will cause an electrical cuit 'to operate said motor.

In testimony whereof we have signed our names to this` specification.

JOSEPH BECK. ALBERT E. GALLIN. 

